nelson



(No Model.) a Sheets-Sheet 1.

A. NELSON;

FRICTION GLUTGH. V,

110.406.4109. Patented July 2, 1889.

(No Model.) 3 Sheets8heet 3.

A. NELSON.

FRICTION CLUTCH. No. 406,109. Patented July 2, 1889..

B 7. I H38.

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UNITED STATES PATENT OFFICE.

ANTHONY NELSON, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO JAMES BENNETT FORSYTH, OF SAME PLACE.

FRICTION-CLUTCH.

SPECIFICATION forming part of Letters Patent No. 406,109, dated J 11157 2, 1889.

Application filed April 25, 1889. Serial No. 308,520. (No model.)

To all whom .it may concern.-

Be it known that I, ANTHONY NELSON, residing in Boston, in the countyof Suffolk and State of Massachusetts, a subject of the King of Denmark, have invented an Improvement in Friction-Clutches, of which the following is a specification, reference being had to the accompanying drawings, in which Figure 1 is a sectional elevation of a frictional clutch embodying my invention. Fig. 2 shows the screw cap and dog, hereinafter described. Fig. 3 is an end View of a pulley and its hub. Fig. 4 is an end view of the screwcap, showing some parts carried by it. Fig. 5 is a sectional view on line 5 5 of Fig. at. Fig. 6 is aperspective of a lever. Figs. 7 and 8 are plan and edge views, respectively, of a friction-plate. Figs. 9 and 10 are plan and edge views, respectively, of another friction-plate; and Figs. 11 and 12 are plan and edge views, respectively, of the ring-follower.

My invention is an improvement on the friction-clutch described in Patent No. 384,268, granted to James Bennett Forsyth June 12, 1888, on an application filed by me, and the main feature of m'yinvention is the combination, with the ring-follower and friction-plates described in that patent, of a screw-cap whereby the ring-follower is brought into proper relation to the friction-plates by turning the cap. In the patent this cap is adjustable by means of screw-bolts and springs to bring the ring-follower into proper relation with the friction-plates, and, while that is a very excellent construction, my clutch is simplified, cheapened, and strengthened by embodying my present invention.

WVhile my improved clutch is shown in the accompanying drawings in connection with a loose pulley only, it may of course be used as afriction-coupling, as shown and described in the patent referred to.

In the drawings, A is a pulley loose on shaft B. Pulley A has secured to it a number of plates at in such manner that the plates must rotate with the pulley, but are free to be moved longitudinally. A second set of plates 1) is secured in like manner as plates a to shaft B, to permit longitudinal movement, plates 0.

alternating with plates 1), as shown, so that pulley A and shaft B are firmly connected by the friction-plates a 1) whenever the plates to and b are pressed together, and pulley A can rotate freely, while shaft B does not rotate when plates at can rotate independently of plates 1). The pulley A has on one side an annular flange a, thereby forming a chamber for the friction -plates, ring-followers, and other related parts, as in the patented clutch referred to but this flange is now threaded to receive a screw-cap F, which is consequently adj ustable, as explained above.

To prevent the cap F from rotating, I provide a locking device ff, whereby the cap is secured in any desired position on the flange a and prevented from moving in either direction. The form of locking device is readily formed by providing cap F with one or more notches f to receive a dog f secured to the hub of the pulley, and their recesses and dog form one variety of locking device ff.

The cover 0, the ring-follower D, and the other parts shown, but not lettered, in the drawings are substantially the same, and operate in substantially the same way as in the patent referred to. The differences in details of construction, which will be noticed by OOIllparing the present drawings with the drawings of the patent referred to, will be readily understood by all skilled in the art without description.

What I-claim is In a friction-coupling, pulley A, having a lateral annular threaded flange a, combined with a screw-cap F and a locking device ff, the flange and cap forming a chamber, all substantially as and for the purpose set forth.

ANTHONY NELSON.

Witnesses:

J. E. MAYNADIER, EDWARD S. BEACH. 

